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The relationship between hand preference, hand performance, and general cognitive ability

Published online by Cambridge University Press:  27 April 2010

MICHAEL E.R. NICHOLLS*
Affiliation:
Department of Psychology, University of Melbourne, Melbourne, Australia
HEIDI L. CHAPMAN
Affiliation:
Department of Psychology, University of Birmingham, Birmingham, United Kingdom
TOBIAS LOETSCHER
Affiliation:
Department of Psychology, University of Melbourne, Melbourne, Australia
GINA M. GRIMSHAW
Affiliation:
Department of Psychology, Victoria University of Wellington, Wellington, New Zealand
*
*Correspondence and reprint requests to: Mike Nicholls, Department of Psychology, University of Melbourne, Parkville, VIC 3010, Australia. E-mail: mike.nicholls@unimelb.edu.au

Abstract

The idea that handedness indicates something about a person’s cognitive ability and personality is a perennial issue. A variety of models have been put forward to explain this relationship and predict a range of outcomes from higher levels of cognitive ability in left-handers or moderate right-handers to lower levels of achievement in left- or mixed-handers. We tested these models using a sample (n = 895) drawn from the BRAINnet database (www.brainnet.net). Participants completed a general cognitive ability (GCA) scale and a test of hand preference/performance. Moderate right-handers, as indexed by their performance measures, had higher GCA scores compared with strong left- or right-handers. The performance measure also showed lower levels of GCA for left-handers compared with right-handers. The hand preference data showed little or no association with cognitive ability—perhaps because this measure clusters individuals toward the extremes of the handedness distribution. While adding support to Annett’s heterozygous advantage model, which predicts a cognitive disadvantage for strong left- or right-handers, the data also confirm recent research showing a GCA disadvantage for left-handers. Although this study demonstrates that handedness is related to cognitive ability, the effects are subtle and might only be identified in large-scale studies with sensitive measures of hand performance. (JINS, 2010, 16, 585–592.)

Information

Type
Research Articles
Copyright
Copyright © The International Neuropsychological Society 2010

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